All links accessed June 29, 2020.

1. NHS Digital. Health Survey for England 2018. Published December 3 2019. https://digital.nhs.uk/data-and-information/publications/statistical/health-survey-for-england/2018

2. Asthma UK. Types of asthma. Last reviewed September 2019 https://www.asthma.org.uk/advice/understanding-asthma/types/

3. NICE guideline NG166. COVID-19 rapid guideline: severe asthma. Published April 3 2020. https://www.nice.org.uk/guidance/ng166

4. Asthma UK. Press release. ‘Asthma death toll in England and Wales is the highest this decade’. August 9 2019. https://www.asthma.org.uk/about/media/news/press-release-asthma-death-toll-in-england-and-wales-is-the-highest-this-decade/

5. DMG Halpin et al. ‘Inhaled corticosteroids and COVID-19: a systematic review and clinical perspective’. European Respiratory Journal. Published online May 7 2020. 55;5. 2001009 https://erj.ersjournals.com/content/55/5/2001009

6. The OpenSAFELY Collaborative. E Williamson et al. ‘OpenSAFELY: factors associated with COVID-19-related hospital death in the linked electronic health records of 17 million adult NHS patients’. medRxiv. Published online May 7 2020. https://www.medrxiv.org/content/10.1101/2020.05.06.20092999v1

7. NICE guideline NG80. Asthma: diagnosis, monitoring and chronic asthma management. Published November 29 2017; last updated February 12 2020. https://www.nice.org.uk/guidance/ng80

8. British Thoracic Society. BTS/SIGN British Guideline on the Management of Asthma. July 2019. https://www.brit-thoracic.org.uk/quality-improvement/guidelines/asthma/

9. L Daines et al. The Primary Care Respiratory Society. ‘Asthma Guidelines in Practice - A PCRS Consensus’. Published July 2019, last modified May 20 2020. https://www.pcrs-uk.org/resource/asthma-guidelines-practice

10. The Primary Care Respiratory Society. Asthma Right Care (ARC). Last modified May 21 2020. https://www.pcrs-uk.org/resource/arc

11.NICE. ‘NICE, British Thoracic Society (BTS) and Scottish Intercollegiate Guideline Network (SIGN) to produce joint guideline on chronic asthma as part of broader 'asthma pathway'’. July 24 2019. https://www.nice.org.uk/news/article/nice-british-thoracic-society-bts-and-scottish-intercollegiate-guidelines-network-sign-to-produce-joint-guideline-on-chronic-asthma-as-part-of-broader-asthma-pathway

12. Asthma UK. Your asthma action plan. Last updated May 2020. https://www.asthma.org.uk/advice/manage-your-asthma/action-plan/

13. Asthma UK. Leaflet: ‘Your asthma action plan’. HA1080216: Last reviewed and updated 2019; https://www.asthma.org.uk/b42999dc/globalassets/health-advice/resources/adults/adult-asthma-action-plan.pdf

14. British Thoracic Society. Asthma Quality Improvement. Asthma Care Bundle. April 22 2016. https://www.brit-thoracic.org.uk/quality-improvement/clinical-resources/asthma/

15. Asthma UK. ‘What should people with asthma do now? How to cut the risk of getting coronavirus and what happens to your usual asthma care’. Last updated June 26 2020. https://www.asthma.org.uk/advice/triggers/coronavirus-Covid-19/what-should-people-with-asthma-do-now/

16. European Respiratory Society. ‘COVID-19 and asthma - World Asthma Day 2020’. May 5 2020. https://www.ersnet.org/the-society/news/Covid-19-and-asthma

17. MY Li et al. ‘Expression of the SARS-CoV-2 cell receptor gene ACE2 in a wide variety of human tissues’. Infectious Diseases of Poverty. Published online April 28 2020. Vol 9; article 45 (2020). https://idpjournal.biomedcentral.com/articles/10.1186/s40249-020-00662-x